Centrifugal and turbine pump.



A. B. JBNNI-NGS. GENTRIPUGAL AND TURBINE PUMP.

APPLICATION FILED JUNE 5, 1913.

L 1 1r 7.,@ m Patented Feb. 9, 1915.

..3 q Il' ,/a /0 /3 /z m'a .H f *y /5 O O O niemeer.

ortica.

RTHUR B. JENNINGS, OF HAZLETON, PENNSYLVANIA, ASSIGNOR T0 INTERNATIONAL STEAM PUMP COMPANY, A CORPORATION 0F N EW JERSEY.

CENTRIFUGAL AND TURBINE PUMP.

Specification of Letters Patent.

Patented lFeb. 9. 1915..

Application led J une 5, 1913. Serial No. 771,843.

To all whom 'it may concern Be it known that l, ARTHUR B. JENNINGS, a citizen of the United States, residing at Hazleton, county of Luzerne, and State of Pennsylvania, have invented lcertain new and useful Improvements in Centrifugal and Turbine Pumps, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to centrifugal or turbine pumps of that class in which afdistributing or diffusion ring surrounds the impeller and is provided with an inwardly extending flange on one or both sides for `closing the side chamber or chambers of the impeller, the invention being especially intended for multistage pumps having double suction impellers, although the broader features of the invention are applicable also to single stage pumps and with single suction impellers.

'lhe `object of the invention is to improve that class of pumps in which dierent impellers and corresponding distributing or diffusion vanes may be substituted in the same casing, so that a standard casing may be used with impellers adapted for the special conditions under which the pump is to be used, and especially to maintain a high eciency with the di'erent impellers and distributing or diHusion rings.

rlFhe invention consists in various features of construction and combinations of parts, allv as fully described and particularly claimed hereafter.

In the accompanying drawings forming a part of this specification, the invention is shown as applied in its preferred form in connection with a multistage pump having three double suction impellers, from which the application of the invention,lwith any number of impellers and with impellers of different types, will be understood.

In the drawings Figure lis a vertical, central, longitudinal section of the pump; and Fig. 2 is a vertical cross section on the line 2 of Fig. 1, with parts in elevation and the casing partly broken away.

Referring to the drawings, A is the cas-l ing, split longitudinally on the central axial line, with its two halves bolted together by bolts 10, as shown in Fig. 2, and having the suction B and delivery C, and the impeller shaft D carrying a series of impellers E and mounted in the casing heads and parti'- tions F formed in the casing and separating the successive stages of the pump.

The impellers E are shown as of a common type of inclosed double suction impeller, and are surrounded by distributing rings through which the liquid is delivered, these distributing rings G being shown as diffusion rings of a common type having ydi'usion vanes a forming passages between them for the liquid passing from the impeller varies b, and the diffusion vanes being provided with passages ll through which the liquid passes from one side of the diffusion rings to the impeller suctions on they opposite side. The diffusion rings G are provided with inwardly extending langes 12 on opposite sides, which close the side impeller chambers and form a running lit with the impeller around the suction opening, suitablepaclring or wearing rings preferably being interposed between the impeller and the flanges 12 to prevent leakage, a common form of labyrinth wearing ring 13 being shown. Between the flanges l2 and outer wall of the labyrinth wearing rings `there is preferably provided a connection l formed by a tongue on one part and groove on the other. The groove may be on either part, but is shown as on the inner edge of the Harige and seating over a tongue or rib on the labyrinth wearing ring, so that a tight joint is formed between the flange and the wearing rings by pressingthem together. The diffusion rings G, with their flanges 12, are divided transversely, being shown as divided diametrically into halves, and the parts into which the diffusion rings are divided are preferably secured together `to formi single rings and close the joints between the parts by bolting them together by flanges and bolts 9, as shown in Fig. 2. The

diusion rings may be positioned in the casing with their dividing line or split at any angle to the casing split, instead of on the same line2 as shown. The diffusion rings are held in place in the casing and tight joints formed between the rings and casing, by providing the casing with interior grooves receiving the extended flanges or the outer edges of the diffusion rings, the shoulders 2 of the grooves pressing against the flanges 3 when the parts of the casing are pressed together, thus closing tightly all joints through which leakage might occur around the outer edges of the diusion rings. The labyrinth Wearing rings 1 may be continuous rings or divided axially, if desired, in the same manner as the casing and diffusion rings. It will be seen that withmthis bonstruction the upper half of the* casing may readily be removed, enabling the impellers and shaft to be conveniently lifted out and the impellers changed, and that, with this change of im ellers, the distributing or diffusion rings 1 may readily be removed and replaced by others corresponding with the changed impelle-rs, and the pump restored to operative condition with all joints closedy and full eiiciency by simply replacing and bolting down the upper casing half.I

It will be understood that the invention is not limited to a pump of the special type shown, nor to the exact construction or arran-gement of parts illustrated, but that the invention as defined by the claims is generally applicable in centrifugal or turbine pumps- What l.. claim isi--v l.. The combination with a pump easing divided axially on a'central line, of one or more impellers mounted in said casing, a distributing ring surrounding each impeller and hav-ing a fiange closing the side impeller chamber and forminga running fit with the impeller, whereby diiferent impellers may be used in the easingV by substituting corresponding distributing rings, said distributing rings being divided transversely, and peripheral surfaces on the distributing rings engaging the casing to form tight joints between the casing and distributing rings when. the casing halves are secured together.

2, The combination with a pump casing divided axially on a central line, of one or more impellers mounted in said casing, a distributing ring surrounding each impeller and -having a iiange closing the side impeller chamber and kforming a running fit with the impeller, whereby different impellers may be used. in the casing by substituting corresponding distributing rings, said distributing rings being divided transversely and having the parts of the rings secured together by means independent of the casing, and peripheral surfaces on the distributing'rings engaging the casing to form tight joints between the easing and distributing rings when the casing halves are secured together.

3: The combination with a pump casing divided axially on a central line, of one or more double suction -impellers mounted in said casing, distributing rings having iianges closing the impeller side chambers on opposite sides of the impellers and havmg a running iit with the impellers at both sides, whereby different impellers may be used in the casing by substituting corresponding distributing rings, the said dis- Lierse? v together.

4. The combination with a pump casing divided axially on a central line, of one^ or more double suction impellers mounted in said casing, distributing rings having flanges closing the impeller side chambers on opposite sides of the impellers and having a running. it with the impellers atl both sides,

whereby different impellers may be used in the casing by substituting corresponding distributing rings, the said distributing rings being divided transversely and having the parts of the rings secured together by means independent of the casing, and peripheral surfaces on the distributing rings engaging the casing to form tight joints bctween the casing and distributing rings when the casing halves are secured together.

5. A multistage centrifu al or turbine pumpl having a plurality o double suction impellers arranged in series, a casing divided axially on a central line, a, distributing ring surrounding each impeller and having flanges closing the impeller chambers on opposite sides and. forming a running fit at both sides of the impeller, said distributing rings being divided transversely and being held in place by the casing when the casing parts are secured together and having per ripheral surfaces on the distributing rings engaging the casing to form tight joints be tween the easing and distributing rings when the casing parts are secured together.

6. A. multistage centrifugal or turbine pump having a plurality of double suction impellers arranged in series, a casing divided axially on a central line, a distribut- 'ing' ring surrounding each impeller and har ing ianges closing the impeller chambers ou opposite sides and forming a running iit at both sides of the impeller, said distributing rings being divided transversely, and having the parts of the rings secured together by means independent of the casing and being held in place by the casing when the casing parts are secured together.

7. The combination with the axially divided pump casing A having interior grooves forming shoulders 2, of distributing rings G fitting said grooves and divided transversely and having peripheral surfaces engaging the easing to form tight joints between the casing and distributing rings when the casing parts are secured together, double suction impellers E within the rings, said rings having flanges 12 closing the side impeller chambers and forming a running fit with the impeller, whereby different impellcrs and distributing rings may be substituted in the easing and tight joints be formed with lll) mamar diderent impellers by securing the parts of the casing together.

8. The combination with the axially divided pump casingAhaving interior grooves forming shoulders 2, of distributing rings G tting said grooves and divided transversely with the ring parts bolted together', double suction impellers E Within the rings, saidl rings having flanges 12 closing the side impeller chambers and form-ing a running fit with the impeller, and Wearing rings 13 between theinner edges of the Hanges and the impeller, whereby different impellers and distributing rings may be substituted in the casing and tight joints be fgrmed with different impellers by securing the parts of the i casing together.

' 9. A multistage centrifugal or turbine pump having a plurality of double suction impellers arranged in series, a casing divided axially on a central line, a distributing ring surrounding each impeller and having flanges closing the impeller, chambers on opposite sides and forming a running fit at both sides of the impeller, said distributing rings being mounted in and sup orted by the easing at their peripheries, vv ereby an open space is left on each side of the distributing rings.

10. A multistage centrifugal or turbine pump having a plurality of double suction 4impellers arranged in series, a casing diside of the distributing rings.

l In testimony whereof, ll havehereunto set my hand, in the presence of two subscribing wltnesses.

ARTHUR B. JENNINGS.

Witnesses:

E. F.- BARREM, J. H. Donemrhrr. 

